#include <stdio.h>
#include <string.h>
#include <stdlib.h>

char* test ()
{
    //char* a = "nihao shijie\n";
    char* a = malloc (13);
    memset (a, 'a', 12);
    a[11] = '\n';
    a[12] = '\0';
    return a;
}

int main ()
{
    printf ("%s", test());
    return 0;
}
